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                # 如何在 Eclipse 上安裝 Java 9 Beta > 原文: [https://javatutorial.net/install-java-9-eclipse](https://javatutorial.net/install-java-9-eclipse) 本教程演示了如何在 Eclipse Oxygen 上安裝和配置 Java 9 Beta 本教程旨在幫助開發人員使用早期訪問 Java 9 構建在正式發布之前測試 Java 9 功能。 本教程已在 Eclipse Oxygen 4.7.0 上使用 JDK 9 build 181 進行了測試。 ## 1.安裝 Java 9 Early Access 構建 轉到 [Java 9 下載頁面](http://jdk.java.net/9/)并下載安裝程序包 ![Download Java JDK 9](https://img.kancloud.cn/9f/ac/9fac5e3a258f0657ebbdcb76ceaec158_710x631.jpg) 下載 Java JDK 9 運行可執行文件,按照步驟操作并安裝 Java 9 ## 2.安裝 Eclipse Oxygen 轉到 [Eclipse 下載頁面](https://www.eclipse.org/downloads/eclipse-packages/)并下載“Java 開發人員的 Eclipse IDE”或“Java EE 開發人員的 Eclipse IDE” 未歸檔的 Eclipse **注意**:您將需要**預先安裝在系統上的 [JDK 8](https://javatutorial.net/install-java-8-jdk-on-ubuntu)** 或更早版本。 如果 Java 9 是僅安裝的 **Java 版本** – Eclipse 將不會啟動。 您將在 eclipse 日志文件中發現以下錯誤: ```java eclipse.buildId=4.7.0.I20170612-0950 java.version=9 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Framework arguments: -product org.eclipse.epp.package.jee.product Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product !ENTRY org.eclipse.osgi 4 0 2017-09-08 12:17:02.768 !MESSAGE Application error !STACK 1 org.eclipse.e4.core.di.InjectionException: java.lang.NoClassDefFoundError: javax/annotation/PostConstruct at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:410) at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:318) at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createDefaultHeadlessContext(E4Application.java:491) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createDefaultContext(E4Application.java:505) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:204) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:614) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590) at org.eclipse.equinox.launcher.Main.run(Main.java:1499) at org.eclipse.equinox.launcher.Main.main(Main.java:1472) Caused by: java.lang.NoClassDefFoundError: javax/annotation/PostConstruct at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:124) at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:399) ... 23 more Caused by: java.lang.ClassNotFoundException: javax.annotation.PostConstruct cannot be found by org.eclipse.e4.core.di_1.6.100.v20170421-1418 at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:433) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:395) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:387) at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150) at java.base/java.lang.ClassLoader.loadClass(Unknown Source) ... 25 more ``` ## 3.添加對 Eclipse 的 Java 9 支持 通過將“安裝”按鈕拖動到正在運行的 Eclipse 窗口中,進入 Eclipse Marketplace 并安裝對 Eclipse Oxygen 的 Java 9 支持。 ![Install Java 9 Support for Eclipse Oxygen](https://img.kancloud.cn/f2/59/f2594c22029cad78354c893b5101c7f4_1024x311.jpg) 安裝對 Eclipse Oxygen 的 Java 9 支持 出現提示時重新啟動 Eclipse ## 4.創建一個 Java 9 Eclipse 項目 打開 Eclipse 并轉到“File -&gt; New -&gt; Java Project” 在“新建 Java 項目窗口”中,單擊“配置 JRE ...”。 ![Eclipse new java project window](https://img.kancloud.cn/4d/53/4d5300d285be2cc56de8ac4629c9cb00_534x724.jpg) Eclipse 新的 Java 項目窗口 在“Installed JRE”窗口中,按“Add…”按鈕 ![Eclipse add new JRE](https://img.kancloud.cn/b4/65/b465bb859c76ecd1bfc737dc1a286c03_715x572.jpg) Eclipse 添加新的 JRE 選擇“標準 VM”,然后按“下一步 &gt;”按鈕 ![Eclipse select Standard VM](https://img.kancloud.cn/90/af/90af438abfbafa939c484e2e1c42e130_525x456.jpg) Eclipse 選擇標準 VM 在“JRE 主目錄”下,按“目錄…”按鈕,然后瀏覽并選擇您的 JRE 9 根目錄。 **注意**:如果您選擇 JDK 目錄,則將無法構建項目 ![Select JRE 9 directory](https://img.kancloud.cn/5a/b1/5ab14057f3c95fa54ad082ec647fdf99_529x521.jpg) 選擇 JRE 9 目錄 按下“完成”按鈕進行確認 ![Finish java 9 installation](https://img.kancloud.cn/db/6a/db6a0a3467cf79daa96247d2676157c4_525x520.jpg) 完成 Java 9 安裝 現在,在列表中選擇`jre-9`并應用更改 ![Select java 9 as default JRE](https://img.kancloud.cn/4a/85/4a85bcc60c207b251fad26914dd0f4ec_713x568.jpg) 選擇 Java 9 作為默認 JRE 返回“創建 Java 項目”窗口,使用“使用執行環境 JRE”下拉菜單為新項目選擇 Java 9。 ![Select java 9 execution environment](https://img.kancloud.cn/e8/07/e80738dedc3af81b679e492e67724803_533x725.jpg) 選擇 Java 9 執行環境 現在您準備嘗試一些 Java 9 新功能 您將在此處找到的許多教程都是基于 Edward Lavieri 博士和 Peter Verhas 博士撰寫的 [Mastering Java 9](https://www.amazon.com/Mastering-Java-reactive-modular-concurrent/dp/1786468735/ref=sr_1_3?ie=UTF8&qid=1520921208&sr=8-3&keywords=mastering+java+9)。 本書將為您提供對 Java 9 新概念和工具的完整而深刻的理解。
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